Ubuntu – PlayOnLinux cannot find wine (from Wine)

Simply open the software centre, search for 7z, click on 7zip, and click install; to make it even easier click:

and then click on the

The original poster, PDiracDelta, provided their solution in a comment:

Actually, I've found the solution: apparently it takes several seconds to populate the list of available Wine versions, with no warning that POL is still populating the list. I seem to have closed it too early each time. But thanks anyway!